Water Movement in Drip Irrigated Sandy Soils

2016 ◽  
pp. 225-252
Keyword(s):  
Water Movement ◽  
Sandy Soils

A numerical model of heat and water movement in furrow-sown water repellent sandy soils

1996 ◽  
Vol 32 (10) ◽  
pp. 3051-3061 ◽  
Author(s):  
Bangjie Yang ◽  
Paul S. Blackwell ◽  
David F. Nicholson
Keyword(s):  
Numerical Model ◽  
Water Movement ◽  
Sandy Soils ◽  
Water Repellent

Impact of a highly swelling gel-forming conditioner (acryhope) upon water movement in uniform sandy soils

1993 ◽  
Vol 8 (1) ◽  
pp. 33-50
Author(s):  
Y. Z. El-Shafei ◽  
A. M. Al-Darby ◽  
A. M. Shalaby ◽  
A. M. Al-Omran
Keyword(s):  
Water Movement ◽  
Sandy Soils

Comparison studies of unsaturated flow below annual and perennial plants

2012 ◽  
Vol 65 (12) ◽  
pp. 2162-2168
Author(s):  
Bill Scott ◽  
Ross Lantzke ◽  
Dave Nicholson ◽  
Paul Findlater
Keyword(s):  
Plant Growth ◽  
Water Content ◽  
Soil Water ◽  
Vertical Profile ◽  
Unsaturated Flow ◽  
Water Movement ◽  
Sandy Soils ◽  
Lambert W Function ◽  
Neutron Moisture ◽  
Soil Water Movement

Values of unsaturated water content determined with neutron moisture measurements (NMM) reveal different water profiles below different plantings. In the extremes, calibration requires a linear and logarithmic response (using the Lambert-W function) along with the normal submersion in a drum of water. Nevertheless a post-calibration with a hydraulic push sampler was used for confirmation. Data were collected at six pastures near the Western Australia coast near Geraldton, with four replicates through the profile. The sites have mostly sandy soils and receive 300–500 mm of rainfall annually. Findings generally showed that, if there was sufficient water, as in 2006, the perennials were able to use the water evenly throughout the vertical profile. Otherwise, with low rainfall, as in 2009, perennials struggle to survive and use less water than the annuals. Modelling of the soil water movement, plant growth and calibration/recalibration is and will be used to get a maximum likehood fit. Clearly, in desert conditions and little or no vegetation, rainfall tends to build up deep in the profile, increase salinity in groundwater, and create waterlogging. Any vegetation is helpful; perennials more so; provided they have sufficient water and are not significantly harvested.

scholarly journals Impact of Sewage Sludge on Water Movement in Calcareous Sandy Soils

1997 ◽  
Vol 2 ◽  
pp. 59
Author(s):  
A.M. AI-Omran ◽  
M.I. AI-Wabel ◽  
A.A. Shalaby
Keyword(s):  
Sewage Sludge ◽  
Sandy Soil ◽  
Water Movement ◽  
Soil Depth ◽  
Sandy Soils ◽  
Water Diffusivity ◽  
Caco3 Content ◽  
Cumulative Infiltration ◽  
Exponential Decrease ◽  
Disturbed Soils

The present study was undertaken to investigate the changes in soil physical properties and their effect on water movement under ponded irrigation. Sewage sludge was applied to 10 cm soil depth at rates of 0.25. 75  and 100 Mg-ha-1 to two disturbed soils differing in CaCO3 content. The results showed that cumulative infiltration (1) decreased with an increase in sewage sludge rates. Basic infiltration for slightly calcareous sandy soil was higher than that of moderately calcareous sandy soil, laboratory measurements showed an exponential decrease in saturated hydraulic conductivity and an increase in available water capacity with an increase in sewage sludge rates. For both soils, water diffusivity (D(Q)) decreased with an increase in sewage sludge rates. The (oral) values of slightly calcareous sandy soils were higher than those of moderately calcareous sandy soils.

Influence of early pasture growth on water movement and leaching of potassium and other cations from sandy soils in a Mediterrranean environment

1970 ◽  
Vol 10 (43) ◽  
pp. 203
Author(s):  
FJ Roberts
Keyword(s):  
Marked Decrease ◽  
Water Movement ◽  
Sandy Soils ◽  
Subterranean Clover ◽  
Growing Season ◽  
Soil Types ◽  
Cation Leaching ◽  
Leaching Loss ◽  
Cation Uptake ◽  
The Mean

Water and cation losses from two soil types were studied in monolith lysimeters fertilized with 375 kg/ha potassium chloride (50 per cent K) and 375 kg/ha superphosphate (22 per cent Ca), in which subterranean clover was grown. An advance of five weeks in time of sowing and germination reduced the mean percolate loss from 26 to 16 cm ; the unsown control lost 31 cm. Potassium leaching decreased from 77 to 37 kg/ha and the unsown treatment lost 87 kg/ha. Magnesium decreased from 26 to 10 kg/ha and the unsown treatment lost 31 kg/ha. With calcium there was a marked decrease from 132 to 51 kg/ha ; the unsown control lost 164 kg/ha. Cation leaching was most severe during the first part of the growing season. Early plant growth reduced cation leaching by increasing the water use and cation uptake. The early sown treatment contained 136 kg/ha K in 9,500 kg/ha DM total tops, whereas the late sown treatment had 94 kg/ha K in 6,300 kg/ha DM total tops. The decreased uptake was similar in magnitude to the increase in leaching loss of potassium.

Influence of upper layer treatment of gel‐forming conditioner on water movement in sandy soils under sprinkler infiltration

1992 ◽  
Vol 6 (3) ◽  
pp. 217-231 ◽  
Author(s):  
Y. Z. El‐Shafei ◽  
A. M. Al‐Omran ◽  
A. M. Al‐Darby ◽  
A. A. Shalaby
Keyword(s):  
Water Movement ◽  
Sandy Soils

Population dynamics of Viola pedata on deep sandy soils in a fragmented and degraded landscape

2020 ◽  
Vol 21 (1) ◽  
pp. 35-44
Author(s):  
Janet L Gehring ◽  
Caitlin Foster ◽  
Alan Yepsen
Keyword(s):  
Population Dynamics ◽  
Sandy Soils
Sign in / Sign up

Export Citation Format

Share Document